EGR Backpressure Transducer: Testing and Inspection

EGR Vacuum Modulator Inspection

PROCEDURE

1. Disconnect the following vacuum hoses from the Exhaust Gas Recirculation (EGR) Vacuum Modulator





Vacuum hose from P port (1)
Vacuum hose from Q port (2)
Vacuum hose from R port (3)
2. Inspect EGR Vacuum Modulator operation.





- Block ports P and R with your finger.
- Blow air into port Q, and check that the air passes through to the air filter side freely.
- Start the engine, and maintain speed at 3,500 rpm.





- Repeat the above test. Check that there is a strong resistance to air flow.
3. Reconnect vacuum hoses to EGR Vacuum Modulator





Vacuum hose from P port (1)
Vacuum hose from Q port (2)
Vacuum hose from R port (3)